The analysis of the milk somatic cell count reducing possibilities
2001
Kiiman, H. (Estonian Agricultural Univ., Tartu (Estonia))
The experimental farms were chosen from agricultural enterprises applying different cow-keeping and milking technologies. Daughters of 21 bulls were studied. The data about ten-month milk yield, somatic cell count, fat and protein content of the milk of the daughters of each bull were collected. Cow's sire, enterprise, lactation, milking equipment and milking operator were fixed in data-base. Monitoring of the working operations of the milkers were carried out. The duration of each element of the working process was recorded. SAS-programm was used for data processing. Procedure REML was used to estimate the dispersion components and heritabilities. From these data analysis we can made following conclusions. The milk somatic cell count increases with lactation number (P0.01). In first lactation the milk somatic cell count was 285 000/ml, in second, third and fourth lactation 321 000/ml, 466 000/ml and 477 000/ml, respectively. The milk somatic cell count correlation between the neighbour lactations was high: between first and second lactation (r
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